When Prince Charles and his then wife Diana visited India in 1992, it was blatantly obvious from their stony facial expressions and frosty demeanours that their marriage was in deep trouble.

Their appearance 24 years ago - two months before their separation was announced - was a world away from the happy smiles and easy companionship their son the Duke of Cambridge, 33, and his wife Kate, 34, have been displaying as they tour India and Bhutan this week.

And Robin Kermode, a communications and body language coach and founder of Zone2, a professional training and coaching consultancy, has confirmed that the couple's loved up body language shows just how deep their bond is.

'Body language doesn't lie and it seems evidently clear from these pictures that the couple is really in love,' he told FEMAIL. 'And it seems a real shame that William's mother wasn't in the same state when she visited India.'

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Body language expert Robin Kermode has been analysing images of Kate and William on their India tour and says it's clear the couple are deeply in love. As they watched a dance performance last night their hands were mirroring each other, their upper bodies leaned in and their smiles were open

One of the most awkward moments of the 1992 royal tour came when Diana appeared to turn her head away from a kiss from Charles after they presented prizes at a polo match in Jaipur

On Tuesday, as Kate and William watched a traditional dance performance by the fireside during a Bihu Festival Celebrationat Diphlu River Lodge, they couldn't have looked more united.

'Here the couple share a laugh at a public performance. Notice the mirroring of their hands, the leaning in of both upper bodies and heads and their open smiles,' said Robin, who has also given a detailed analysis of their body language on Facebook.

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Yesterday, the couple enjoyed a safari at the Kaziranga National Park and enjoyed a wonderfully intimate moment where Kate was seen smiling at her husband and looking right into his eyes as he held a hand to his face.

'This is very private moment in a public situation,' Robin said. 'It’s as if they are unaware of the world around them and time stands still. We get the feeling that they might have held this eye contact for several moments in an open-hearted, genuine way.'

During this moment at Kaziranga National Park this morning, it was as if they were unaware of the world around them and time stood still as they held eye contact for several moments in an open hearted, genuine way

They also shared a very personal moment while in the public eye on a visit to Pan Bari Village in the Kaziranga National Park earlier on Wednesday.

As they sat cross legged on the floor, Kate leaned in towards her husband and seemed to be wordlessly communicating with him as he returned her gaze.

'This is a wonderfully genuine picture of young love. They appear to be in a world of their own, holding eye contact, subconsciously sharing a moment together,' Robin explained.

By contrast, Charles and Diana's India tour became notorious because of a famously awkward moment when Diana appeared to turn her head away from a kiss from Charles after they presented prizes at a polo match in Jaipur.

As the couple made their way into the Indian Prime minister's residence in Delhi for lunch, William was seen gently placing a guiding hand on the small of his wife's back as they walked up the steps

William is not striding ahead here but is slightly leading the way in a gentlemanly and gallant manner while offering his wife support

Dickie Arbiter described the moment in his book 'On Duty With The Queen: My Time as a Buckingham Palace Press Officer', confirming that the Princess had indeed deliberately turned away after her husband forgot to kiss her for the cameras.

'Realising his mistake, he hastily returned and, with an uncertain crowd looking on, moved to kiss his wife's cheek,' Mr Arbiter wrote. 'Incensed, the Princess swivelled her head so that the kiss landed near her ear.

'The crowd, as well as those of us accompanying the royal couple, could only cringe. The Prince had clearly been intentionally humiliated, and we knew he'd be furious.'

Analysing the photo, Robin told FEMAIL: 'This is a classic "public" gesture of affection. Charles’ left hand is tense, it is too high on Diana’s back, her head pulls away from his mouth and Charles wears a forced grimace. All this shows is how uncomfortable this public embrace actually is for both of them.'

Meanwhile William has been making tender displays of affection for his wife that are all the more touching for their spontaneity.

Robin said Charles and Diana were like two bookends in this photo – kept deliberately apart as an excuse not to be together

Their heads are turned to each other and their upper bodies are leaning in together. Kate’s weight is on her right foot bringing her closer towards William

As the couple made their way into the Indian Prime minister's residence in Delhi for lunch, he was seen gently placing a guiding hand on the small of his wife's back as they walked up the steps.

'William is gently supporting his wife with a classic supportive gesture, his hand in the upper part of the small of her back,' Robin said. 'His hand is relaxed. It is not pushing into her back and is not a controlling gesture. He is showing her respect and offering support.'

He also placed a guiding arm around her as they arrived at a Bollywood gala on the first night of the tour, which Robin described as 'gentlemanly'.

'William is not striding ahead here but is slightly leading the way in a gentlemanly and gallant manner, respectfully presenting Kate. His right arm and hand look natural and his gestures are open. Both their smiles are genuine.' he said.

They both howled with laughter as they played football with children in Mumbai on Sunday morning and looked so relaxed that the image could have been anyone's regular holiday photo

Kate and William looked particularly natural as their hands spontaneously touched while they were being shown an automatic dosa making machine during a meeting with young entrepreneurs in Mumbai

Th couple were seen sharing a joke as they visited the Banganga Water Tank in Mumbai, wearing floral garlands. Despite being on duty they still managed to look happy and relaxed

We've also seen examples of the couple enjoying genuine moments of fun together in the midst of their royal duties. They both howled with laughter as they played football with children in Mumbai on Sunday morning.

'Here Kate and William are looking physically relaxed and happy,' Robin said. 'Their upper body gestures are open with big wide smiles. Their legs are casually relaxed.

'This could almost be a normal family holiday shot, in contrast to more formal royal appearances. They look every bit the young couple in love.'

They were also seen sharing a joke as they visited the Banganga Water Tank in Mumbai, wearing floral garlands.

'When couples are in tune with each other, they will often mirror gestures quite naturally. Here they are standing with arms in front showing respect to their surroundings but still managing to look happy and relaxed,' Robin explained.

Kate and William looked particularly natural as their hands spontaneously touched while they were being shown an automatic dosa making machine during a meeting with young entrepreneurs in Mumbai.

'Here William is leaning in and sharing the moment as they hold hands,' Robin explained. 'Their hand gestures are gentle and almost caressing.'

THE SIGNS OF A COUPLE IN LOVE

1. Mirroring gestures

This shows how well ‘in sync’ a couple is, according to Robin. So when a couple is having dinner at a restaurant, when one person leans in to take a sip of wine, then the other will.

If one is leaning on their left arm, the other will ‘mirror’ and lean on their right arm. This will often be unconscious.

They will generally eat at the same pace, so one person is not left eating whilst the other has cleared their plate five minutes earlier.

2. Leaning in and facing each other

Couples in love tend to face each other and lean their heads together.

3. They walk side by side

A couple in love will often turn to look at each other when walking. If one is always ahead they cannot connect properly.

4. Genuine smiles

Their smiles are genuine. Not just their mouth turns up at edges, but their eyes are also smiling. They share jokes and moments together. They might throw back their heads in a relaxed way.

5. Physical contact

They hold hands, touch (appropriately!) whenever they can. For example, couples watching TV often touch their feet if sitting at either end of a sofa.

6. Eye contact.

They will hold eye contact longer than the usual 2-3 seconds.

7. They seem physically relaxed with each other.

Their gestures will generally be open and they will appear relaxed – rather like we do when on holiday in the sunshine!

However, when Charles and Diana met Sonia Gandhi, their smiles looked slightly out of sync and a little tired, as if it was taking a huge effort to appear to be happy.

And when William's parents attended a banquet given by the then Indian Vice-President Shankar Dayal Sharma the couple stood well part as they posed for a photo.

The normally poised Princess looked slightly uncomfortable with her hands behind her back, while her husband stood with his shoulder slightly turned away from her with his hand placed in his pocket.

'Here they are like two bookends – kept deliberately apart as an excuse not to be together,' Robin agreed.

The gulf between the couple was made even more obvious when Diana posed alone in front of the Taj Mahal in what has now become a famous image.

'This iconic photo says it all. If ever there were a place to be romantic it would be here,' Robin said. 'The Taj Mahal is a place where couples would naturally pose together.

As they sat cross legged on the floor, Kate leaned in towards her husband and seemed to be wordlessly communicating with him as he returned her gaze during a visit to Pan Bari Village in the Kaziranga National Park

'The fact that she chose to be pictured here completely alone, not with even a tourist in sight, was a major statement to the world. She chooses to sit in a way that makes her look small and alone. Her shoulders are down and all gestures are closed.'

Kate and William, however, stay physically close to each other at all times.

For example, they were seen leaning together as they were greeted with a ceremonial welcome as they arrive at Tezpur Airport in Assam yesterday.

'Here their heads are turned to each other and their upper bodies are leaning in together. Kate’s weight is on her right foot bringing her closer towards William,' Robin said.

But it the same could hardly be said for Charles and Diana. At the polo match in Jaipur, even before the awkward kiss took place Charles and Diana's clenched smiles, which didn't reach their eyes, spoke volumes.

'They both look straight ahead, with Charles’ body weight leaning away from Diana. He appears to be trying to smile, but is looking strained. They seem completely unconnected,' Robin explained.

In another photo they're seen standing slightly apart, leaning away from each other.

'The distance between them appears to be their choice,' Robin said. 'Their hand gestures seem closed. Notice that they are not mirroring gestures at all.'

The royals' smiles looked slightly out of sync and a little tired, as if it was taking a huge effort to appear to be happy as they met Sonia Gandhi

The Taj Mahal is a place where couples would naturally pose together. The fact that Diana chose to be pictured here completely alone, not with even a tourist in sight, was a major statement to the world

There are several other examples showing the gulf between them including a photo in which the couple were dressed in matching safari colours.

But the co-ordination ended there as they stood several feet away from each other.

'Here again, the couple are standing apart from each other with no mirroring at all. There is nothing ‘shared’ in their body language here. They seem to be two strangers,' Robin commented.

On another occasion, they chose to stand apart as they received gifts of flowers and garlands rather than as a couple.

Charles appears to be trying to smile, but is looking strained. They seem completely unconnected

Charles and Diana were pictured standing apart from each other with closed hand gestures at a polo match (left). On another occasion there was so little shared body language they looked like strangers (right)

On another occasion, they chose to stand apart as they receive gifts of flowers and garlands rather than as a couple

Diana is looking down and away, completely unconnected with the events happening before her. She looks dreadfully sad and tired

During another exchange of gifts, Prince Charles looked mournful by contrast to a happy looking man who presented him with a silver replica of a building.

'This is a very sad photo. Charles is looking directly at a smiling man who is giving him a gift, but Charles cannot manage even a flicker of a smile,' Robin said.

'Diana is looking down and away, completely unconnected with the events happening before her. She looks dreadfully sad and tired.'